I've had a few requests to share the results of some research I did last fall on children with hearing impairments adopted from Asian countries. I have rather a lot of data to wade through, and I don't want to publish it all on the web before getting a published journal article or at least a conference poster finished. :) To summarize my own work: I did a series of case studies of children adopted from Asian countries who were identified with a hearing loss after arriving in the U.S. By and large, they were doing as well - or better - than the preliminary guidelines published by other researchers in the field describing
normally hearing children (let alone children with hearing loss!). There were exceptions, but these children also were later identified with their hearing losses, and there may have been other cognitive issues involved. It's important to remember that children are individuals, and studying a small number of children does not mean it's necessarily the "norm"! That said - here's some of what has actually been done by other researchers in the field (who have had larger sample sizes than I), with some general background included:
Many thousands of children have been adopted internationally by parents living in the United States. Citizens of the United States adopt more children from foreign countries than any other nation in the world. Reports from the United States Citizen and Immigration Services (USCIS) indicate that over 200,000 internationally adopted children already live in the United States, and 20,000 more arrive every year (2005). In the year 2004, 22,911 visas were issued to children being adopted from other countries. Most of these children come from China, Russia, and Guatemala. These three countries account for over 16,000 of the visas issued to international adoptees in 2004 alone. The majority of internationally adopted children come from China, and it is expected that this trend will continue. Just over 7,000 of the international adoption visas issued in 2004 were for Chinese children, and 6,683 of those were for Chinese girls. In 2000 and 2001, approximately one in four adoptions in the United States was an international adoption (not including private agency, kinship, or tribal adoptions) (U.S. Department of Health and Human Services, 2004).
Transitions for internationally adopted children can be very difficult, particularly if the child is already challenged by a special need of some kind. Many children have been institutionalized for most of their lives, and may suffer from sensory deprivation or neglect. Seventy-five percent of children adopted from China have some kind of developmental delay related to institutionalization (Miller and Hendrie, 2000). Many are nutritionally compromised, and have heights and weights that are below the 10th percentile for their ages. It has been reported that for every 2.86 months spent in an institution, adopted children lose 1 month of height age. Thirty-five percent arrive in the United States with anemia. Miller and Hendrie report that internationally adopted children are at greater risk for presenting certain infectious diseases such as hepatitis B (28% had antibodies or antigen to the disease) and hepatitis C (one child in their sample of 452 had antibody present), syphilis (one child in 452 found to have contracted the disease congenitally), tuberculosis (3.5% had positive skin results; all had clear chest radiographs) and intestinal parasites such as Giardia (9%). Unsuspected medical diagnoses such as hearing loss, orthopedic problems and congenital anomalies were found in 18% of the children assessed. Many of them are not up to date on immunizations. (Barnett, 2005; Saiman, et al., 2001; Miller & Hendrie, 2000; Miller, 2005; Hostetter, 1999). Adopted children present more behavioral problems than non-adopted children, but internationally adopted children show fewer overall behavioral problems than domestic adoptees (Juffer & van IJzendoorn, 2005).
There are scores of children on various adoption agencies' "waiting children lists," which are made available to prospective adoptive parents, most of whom are older or have special needs ranging from minor birthmarks to major or multiple disabilities. Many of these children have medically correctible conditions, such as ventricular septal defects (VSD) of the heart, cleft lip and palate, or club feet. Adoptions for these children are expedited, and often adoption fees are reduced, making the adoption process itself smoother for prospective parents. Many strategies are available to assist adoptive parents in easing the child's transition to a permanent home, as unexpected challenges inevitably arise (Costello, 2005; Nalven, 2005; Dole, 2005).
Generally very little is known about the family and medical histories of children that are adopted internationally. In China, most babies are anonymously abandoned (usually in high-traffic areas where the babies are likely to be found quickly) before being found and brought to social welfare institutes where they are raised. Most abandoned babies in China are girls. While this phenomenon is largely attributed to the one-child policy in China and a cultural preference for boys, first-born girls are rarely abandoned (Johnson, 2004).
Many adoptive parents have questions about what to expect from their adopted children, especially in terms of language acquisition. They wish to know how soon their child will learn English, and what the "normal" rate of language development is for a child who is learning a new language. Speech-language pathologists and audiologists should be familiar with international adoptees' language acquisition, in order to provide accurate recommendations for therapy as appropriate. The percentage of international adoptees that receive speech-language services is high; one study cites 35% (Glennen & Masters, 2002). Another Glennen study examining internationally adopted children from Eastern Europe found that 65% of 28 children evaluated between 12 and 24 months of age did not need speech-language services; 28% were recommended for early intervention, and another 7% were borderline, requiring follow-up testing later on (Glennen, 2005). Adoptive parents should be prepared for the possibility that their child will need special services.
Generally, the birth language of the child (L1) is arrested at the time of adoption, as it is very rare for the adoptive parents to be able to provide a fluent bilingual model for the child (Glennen, et al 2002). So, the second language (L2) is learned as a "second first language" and L1 is lost. Attrition of L1 in international adoptees does not seem to adversely impact learning of the new language (Glennen, Rosinsky-Grunhut & Tracy, 2005). Researchers note that in many cases, children are not proficient in L1 at the time of adoption, because of issues related to institutionalization and auditory deprivation. Delays in language and activities of daily living skills tend to increase with the duration of orphanage confinement (Miller & Hendrie, 2000). When the adopted child is placed into the rich L2 environment, language acquisition is much more supported by the parental model, and often proceeds very quickly.
Results of one study of 452 adopted Chinese children (443 of whom were girls) indicated that 43% had a language delay upon arrival (Miller & Hendrie, 2000). Six of these children were diagnosed with hearing loss (1.3%), and one of the six acquired a cochlear implant. Twelve had problems with chronic otitis media (2.6%). While these may seem like grim statistics, it appears that most international adoptees catch up quickly with their non-adopted peers.
After three months in the United States, most preschool-aged adoptees have vocabularies that rival monolingual non-adopted children's vocabularies at age 24 months. Age at adoption does not appear to be a significant predictor of vocabulary size (Snedecker, Geren & Martin, submitted; Geren, Snedecker & Ax, 2005). Language acquisition for international adoptees seems to follow the monolingual infant model. Early on, lexicons are dominated by nouns, length of utterance is very short, and functional morphemes are almost entirely absent. In later stages, lexicons become more diverse, utterances become longer, and closed-class morphemes come into greater use. Preschoolers tend to reach the ceiling of the MacArthur Child Development Inventory (CDI) measure relatively quickly, making it less useful after the first year home.
Researchers have found that by age 2 1/2, the majority of Chinese international adoptees have no apparent delay in acquisition of expressive English vocabulary (Krakow & Roberts, 2003). Longitudinal case studies of two children portrayed an instance where a child adopted at a younger age showed a faster rate of lexical and phonological development than the child adopted at an older age. However, at two years post-adoption, the child who was later-adopted was within normal limits on all measures but one (her score on the Expressive One Word Picture Vocabulary Test). Time spent living in an institutionalized setting and possible cognitive differences were cited as possible reasons for the difference in language abilities in these two children (Pollock, Price & Fulmer, 2003).
This lack of vocabulary delay was confirmed in two more studies, which examined overall language acquisition in international adoptees. Fifty-five preschoolers that had been in their permanent home for more than two years were evaluated, and it was found that approximately 15% of the preschool-aged internationally adopted children scored below average on at least two or more measures in a battery of speech-language tests (Roberts, Krakow, & Pollock, 2003). The same research group performed a later study, and it was found that slightly over 5% scored below average on a battery of standardized language tests (Roberts, et al., 2005). The vast majority scored within or above the average range as compared to non-adopted English-speaking peers, many scoring in the moderately to extremely high range, which should be very encouraging news to adoptive parents. The children who scored below average in 2003 were also the children who had been exposed to English for the least amount of time. Follow-up with the low-scoring children when they reached school age revealed that half of the below-average scorers had made sufficient gains to move them into the average range for their age group (Roberts, Pollock & Krakow, 2005). Twelve percent of the low scorers remained below average, even after an additional 2 years of English language exposure.
Glennen and Masters have provided normative data for language acquisition in children adopted from Eastern Europe (2002). For children adopted at young ages (<12 months), English words and phrases emerged at the same ages as non-adopted monolingual English-speaking peers. Language comprehension and expression abilities were at age level by 30-36 months of age. Children adopted at older ages made rapid gains in English vocabulary acquisition. Generally, a child adopted between the ages of 13-18 months should have 50 words by 24 months of age, a child adopted between the ages of 19-24 months should have 50 words by 28 months of age, and those adopted between 25-30 months should have 50 words by 31 months of age. Internationally adopted children who arrived in the United States between 13-18 months of age showed only a 2-4 month delay compared to their non-adopted English-speaking peers at 37-40 months. Children adopted at older ages showed more substantial delays, particularly in expressive syntax as opposed to vocabulary skills. More research is needed to explore at what ages later-adopted children catch up to their non-adopted English-speaking peers.
A chart provided by Dr. Glennen of Towson University on her website:
http://pages.towson.edu/sglennen/index.htmSome preliminary normative data for language growth in normally hearing internationally adopted children from China have been compiled (Pollock, 2005). It was found that the Chinese adoptees in this study acquired vocabulary at least as quickly as those in the Glennen and Masters study, and that later adoptees actually acquired 50 words several months earlier than those in the Glennen and Masters study in many cases. Different instruments were used, and a different gender distribution was present for these two studies (the Pollock study had over 99% girls), which may account for some of the language differences observed. Overall cognitive differences may have existed between the groups studied, as well.
Several researchers have found that older adoptees made very rapid strides in vocabulary acquisition, learning English faster than younger adoptees, but had farther to go in terms of overall catch-up (Pollock, 2005; Krakow & Roberts, 2003; Krakow, Tao & Roberts, 2005).
Oral language acquisition is facilitated by audition and access to fluent adult models of language. Early identification and early intervention provides greater opportunities to deaf and hard of hearing children to receive the support they need for appropriate language acquisition. In particular, children identified before the age of 6 months have better language outcomes than those identified after 6 months (Yoshinaga-Itano, 2003; Yoshinaga-Itano & Apuzzo, 1998). Internationally adopted children tend to be late-identified, due to a lack of resources to provide audiological evaluation pre-adoption. Newborn hearing screening has only recently been implemented in very few hospitals in China, and most abandoned baby girls have never been screened (Ng, et al., 2004; Nie, et al, 2003; Johnson, 2004; Wong, 2004; Xu & Li, 2003). Miller and Hendrie reported that unexpected diagnoses of hearing loss were found in 6 out of 192 adopted children that were examined for overall health post-adoption (3.1%). It is vital to impress upon adoptive parents the importance of obtaining a hearing screening for their children upon arrival in the United States.
Because of the time involved in preparing and becoming approved for international adoption (12-18 months for China), it is very rare for a child to be adopted that is younger than 6 months of age. Chinese Children Adoption International, an adoption agency handling international adoption of Chinese children, reports that the youngest babies currently coming home from China are about 7 months of age (2005). Until universal newborn hearing screenings are implemented worldwide, including rural areas of third-world nations, internationally adopted children will likely all be late-identified. It will be very interesting to see whether internationally adopted children with hearing loss are any more delayed than their non-adopted peers with hearing loss in the United States. (More updates on this after I present my data in a professional forum!)
References
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Chinese Children Adoption International (2005). Qualifications to adopt from China. Centennial, Colorado: Zhong, J.
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Geren, J., Snedecker, J., & Ax, L. (2005). Starting over: a preliminary study of early lexical and syntactic development in internationally adopted preschoolers. Seminars in Speech and Language, 26(1), 44-53.
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